Medicaid is not universal health care. It is a means-tested program that covers specific groups of low-income Americans, not the entire population. Universal health care, as defined by the World Health Organization, ensures that all people have access to needed health services regardless of socioeconomic status, employment, or ability to pay. Medicaid, by design, excludes anyone who earns above its income thresholds.
What Universal Health Care Actually Means
Universal health care is a system where every person in a country has access to medical services without facing financial hardship. The vast majority of post-industrial Western nations use some version of this model, though the specifics vary. Some countries run single-payer systems where the government directly funds care. Others mandate private insurance with heavy subsidies so no one falls through the cracks. The common thread is coverage for everyone, not just those who qualify.
The United States takes a fundamentally different approach. It relies on a patchwork of employer-sponsored private insurance, government programs like Medicaid and Medicare, marketplace plans subsidized by the Affordable Care Act, and out-of-pocket spending. No single system covers all Americans, and millions remain uninsured in the gaps between programs.
How Medicaid Eligibility Works
Medicaid is a joint federal and state program that helps cover medical costs for low-income people, families with children, pregnant women, elderly individuals, and people with disabilities. Eligibility depends on where you live, how much you earn, and which category you fall into. States set their own rules within federal guidelines, using percentages of the federal poverty level as income cutoffs. For reference, the federal poverty level for a family of four in 2024 is $31,200. States typically set Medicaid thresholds at 133% or 185% of that line, depending on the population group.
This means a single adult in one state might qualify with an income that would disqualify them in another. The program is not portable the way universal systems are. If you move, your eligibility can change overnight.
Immigration status adds another layer. Lawful permanent residents generally face a five-year waiting period before they can enroll, though refugees and asylees are exempt. Some states have opted to waive the waiting period for pregnant women and children. Undocumented immigrants are almost entirely excluded from Medicaid coverage.
The Expansion Gap
The Affordable Care Act gave states the option to expand Medicaid to nearly all adults earning up to 138% of the federal poverty level, roughly $21,597 for an individual in 2025. As of now, 41 states including Washington, D.C. have adopted the expansion. Ten states have not: Florida, Georgia, Kansas, Mississippi, South Carolina, Wisconsin, Wyoming, and three others.
In non-expansion states, many low-income adults fall into a coverage gap. They earn too much for traditional Medicaid but too little to qualify for subsidized marketplace insurance. This gap is one of the clearest illustrations of why Medicaid differs from universal coverage. In a universal system, no one’s access to care depends on which state they happen to live in.
Who Medicaid Actually Covers
About 68.8 million people were enrolled in Medicaid as of November 2025, with the combined Medicaid and CHIP (Children’s Health Insurance Program) total reaching roughly 76 million across all 50 states and D.C. That’s a substantial share of the U.S. population, but it still leaves out the majority of Americans. By contrast, a universal system would cover all 330-plus million residents.
Medicaid enrollment also fluctuates significantly based on policy changes. When the federal government required states to keep people continuously enrolled during the COVID-19 public health emergency, enrollment swelled. Once that requirement ended in 2023, states began reviewing eligibility for tens of millions of people. From April 2023 through June 2024, about 94.3 million individuals were due for renewal. Of those, 22% had their coverage terminated. Nearly 69% of those terminations were procedural, meaning people lost coverage because they didn’t complete paperwork rather than because they were actually ineligible. Long call center wait times and processing delays compounded the problem.
This kind of churn is unique to means-tested programs. In a universal system, you don’t lose your health coverage because you missed a renewal deadline.
What Medicaid Covers
Medicaid’s benefit package is actually quite broad in some respects. Federal law requires states to cover hospital stays, doctor visits, lab work, nursing facility care, home health services, family planning, and transportation to medical appointments. For children, a comprehensive screening and treatment benefit catches conditions that might otherwise go undiagnosed.
However, many important services are optional at the state level. Prescription drugs, dental care, physical therapy, eyeglasses, and mental health services for certain populations are all categories that states can choose to cover or skip. Most states do cover prescription drugs, but dental benefits for adults remain spotty. This means two Medicaid enrollees in different states can have very different access to care, another departure from the consistency that defines universal systems.
Access Challenges Within Medicaid
Having a Medicaid card doesn’t always translate to easy access to a doctor. Estimates suggest that 75% to 95% of physicians accept at least some Medicaid patients, and roughly nine in ten primary care physicians treated at least one adult Medicaid patient in recent years. But many physicians limit the number of new Medicaid patients they take on, and Medicaid typically represents a small share of their overall patient panel. The program’s lower reimbursement rates compared to private insurance make it less financially attractive for providers.
Pediatricians are the notable exception. Medicaid patients make up a much larger share of pediatric practices, reflecting the program’s heavy focus on children’s coverage.
For enrollees, the practical effect is that finding a specialist or even a primary care doctor who accepts Medicaid can require more effort and longer wait times than someone with private insurance would face. Universal systems can have their own wait-time issues, but the access disparity based on insurance type is a distinctly American problem.
How the U.S. System Compares
The U.S. spends more per person on health care than any other wealthy nation, yet it is the only one without some form of universal coverage. Medicaid, Medicare, the Veterans Affairs system, and ACA marketplace plans each serve different slices of the population, but together they still leave gaps. Non-inclusive systems limit quality health care access to those who can afford it or have employer-sponsored insurance.
Medicaid is the closest the U.S. comes to a safety-net program for low-income residents, and it plays a critical role for the populations it serves. But it is means-tested, state-dependent, subject to enrollment churn, and limited to certain groups. Universal health care, by definition, has none of those restrictions. Medicaid is a piece of the American health care puzzle. It is not, and was never designed to be, universal coverage.